some electrical math need help
For the large items (oven, etc.) you named, the numbers look appropriate.
At that moment the three items (and perhaps some lights or TV or other things also turned on) were together drawing about 54 amps at 240 volts or 13 kilowatts.
If this load went on, constant, for an hour you will have consumed 13 kilowatt hours.
If there were some 120 volt items turned on, chances are the current on one side of the 240 volt service won't be exactly the current on the other side, for example you might have 55 amps at 120 volts on one side and 53 amps at 120 volts on the other side, still a total of around 13 kw. (You could also say the latter as 53 volts at 240 volts across both sides plus 2 amps at 120 volts across one side.)
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 12-01-2009 at 09:05 AM.